package net.minecraft.pathfinding;

import net.minecraft.entity.Entity;
import net.minecraft.util.Vec3;

public class PathEntity {
	/** The actual points in the path */
	private final PathPoint[] points;

	/** PathEntity Array Index the Entity is currently targeting */
	private int currentPathIndex;

	/** The total length of the path */
	private int pathLength;

	public PathEntity(PathPoint[] pathpoints) {
		this.points = pathpoints;
		this.pathLength = pathpoints.length;
	}

	/**
	 * Directs this path to the next point in its array
	 */
	public void incrementPathIndex() {
		++this.currentPathIndex;
	}

	/**
	 * Returns true if this path has reached the end
	 */
	public boolean isFinished() {
		return this.currentPathIndex >= this.pathLength;
	}

	/**
	 * returns the last PathPoint of the Array
	 */
	public PathPoint getFinalPathPoint() {
		return this.pathLength > 0 ? this.points[this.pathLength - 1] : null;
	}

	/**
	 * return the PathPoint located at the specified PathIndex, usually the current
	 * one
	 */
	public PathPoint getPathPointFromIndex(int index) {
		return this.points[index];
	}

	public int getCurrentPathLength() {
		return this.pathLength;
	}

	public void setCurrentPathLength(int length) {
		this.pathLength = length;
	}

	public int getCurrentPathIndex() {
		return this.currentPathIndex;
	}

	public void setCurrentPathIndex(int currentPathIndexIn) {
		this.currentPathIndex = currentPathIndexIn;
	}

	/**
	 * Gets the vector of the PathPoint associated with the given index.
	 */
	public Vec3 getVectorFromIndex(Entity entityIn, int index) {
		double d0 = (double) this.points[index].xCoord + (double) ((int) (entityIn.width + 1.0F)) * 0.5D;
		double d1 = (double) this.points[index].yCoord;
		double d2 = (double) this.points[index].zCoord + (double) ((int) (entityIn.width + 1.0F)) * 0.5D;
		return new Vec3(d0, d1, d2);
	}

	/**
	 * returns the current PathEntity target node as Vec3D
	 */
	public Vec3 getPosition(Entity entityIn) {
		return this.getVectorFromIndex(entityIn, this.currentPathIndex);
	}

	/**
	 * Returns true if the EntityPath are the same. Non instance related equals.
	 */
	public boolean isSamePath(PathEntity pathentityIn) {
		if (pathentityIn == null) {
			return false;
		} else if (pathentityIn.points.length != this.points.length) {
			return false;
		} else {
			for (int i = 0; i < this.points.length; ++i) {
				if (this.points[i].xCoord != pathentityIn.points[i].xCoord
						|| this.points[i].yCoord != pathentityIn.points[i].yCoord
						|| this.points[i].zCoord != pathentityIn.points[i].zCoord) {
					return false;
				}
			}

			return true;
		}
	}

	/**
	 * Returns true if the final PathPoint in the PathEntity is equal to Vec3D
	 * coords.
	 */
	public boolean isDestinationSame(Vec3 vec) {
		PathPoint pathpoint = this.getFinalPathPoint();
		return pathpoint == null ? false : pathpoint.xCoord == (int) vec.xCoord && pathpoint.zCoord == (int) vec.zCoord;
	}
}
